The general procedures used to develop educational objectives for the National Assessment of Educational Progress are outlined, as are the procedures used to develop science objectives. Four primary objectives of science education are stated: "Know fundamental facts and principles of science"; "possess the abilities and skills needed to engage in the processes of science"; "understand the investigative nature of science"; and "have attitudes about and appreciations of scientists, science, and the consequences of science that stem from adequate understandings." Each primary objective is divided into sub-objectives. Behaviors typical of four chosen ages, 9-, 13- and 17-year olds and adults, are delineated for many of the sub-objectives. Appendices list the names of scientists, of lay panel chairmen, and of educational organizations involved in developing the objectives. (EB) Primary type of information provided by report: Assessment Instrument (Objectives); Procedures (Objectives Development).